baetz



H. BAETZ.

AIR HEATING APPARATUS.

APPLICATION FILED MAR. 5. 191a.

Patented July 15, 1919.

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AIR HEATING APPARATUS.

APPLICATION FILED MAR. 5. 19IB.

m H T MM m h; Em T V .Jn N 0% nu t2 n aw LI. a P w 5 9 w 9 6 9 w 0 W 3 w 1 A TTO/F/VF Y HENRY BAETZ, OF ST. LOUIS, MISSOURI.

AIB-HEA'HNG APPARATUS.

Specification of Letters Patent.

Patented July L5, 1919.

Application filed March 5, 1918. Serial No. 220,499.

To all whom it may concern:

Be it known that I, HENRY BAETZ, a citizen of the United States,- residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Air- Heating Apparatus, ofwhich the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

The present invention is an improvement on the structure of air heating apparatus forming the subject-matter of U. S. Letters Patent N 0. 604,013, issued to me under date of May 17, 1898; and while having the same objects in view and possessing the same advantages as the patented structure, the improvement herein contemplates certain changes in the disposition of the steam coils whereby with the same size of easing I am enabled not only to increase the heating sur face for the air circulating among the coils, but am enabled to install the necessary piping offering such increased heating surface without in any wise interfering with the freedom of that circulation. The resulti is that a given volume of air passing through the casing in a unit of time will absorb more heat units than under the old construction, thereby increasing the efliciency of the structure as an air heating apparatus. A further object of my improvement is to provide certain details of construction collectively contributing to make a very eficient heater as will more fully appear from the following detailed description of the invention in connection with-the accompanying drawings in which Figure 1 represents a front elevation of the apparatus with a part of the wall of the outer casing removed to show the interior disposition of the steam coils; Fig. 2 is an enlarged perspective view showing a detail of a portionof the drain pipe and staggered arrangement of nipples forming the lower terminals of the steam coils; Fig. 3 is a top plan of the circulating coils and a cross-section of the casing on the line 33 of Fig. 1; Fig. 4 is a vertical cross-sectional detail on the zig-zag line 44. ofFig. 1; Fig. 5 is a vertical longitudinal detail section of the drain and waste pipes showing controlling valve therefor; Fig. 6 is a cross-section on the line 66 of Fig. 5; and Fig. 7 is an end view of the bottom drain pipe to which the valve-controlling expansion. member is secured.

Referring to the drawings, 1 represents a casing preferably rectangular in cross-section, the steam headers or main steam pipes 2, 3;, thereof being disposed in superposed horizontal planes along the upper portions of the inner surfaces of the two contiguous walls of the casing, said pipes deriving their steam preferably from a common source of supply (not shown) with which they'may be connected through a fitting l (shown dotted) or in any suitable way known to the art, and v by means well within the purview of the skilled mechanic. Disposed along the inside of the same wall with a header 2 below said header and spaced a suitable distance therefrom and parallel therewith is a drain'pipe 2; and disposed along the inside of the same wall with the header 3 below said header and spaced a suitable distance therefrom and parallel therewith, and above the drain pipe 2 is a drain pipe 3, the pipes 2 and 2 being disposed in horizontal planes exterior to the horizontal planes of disposition of the pipes 3, 3, or in other words the pipes 2, 2', are spaced farther apart than are the pipes 3, 3. Disposed in vertical planes between the header 2 and its corresponding drain pipe 2, and extending across the casing, and spaced suitable horizontal distances apart are two sets of pipe coils-5, 5', respectively alternating with one another, the lower ends of the former being coupled to the drain pipe 2 through the short nipples a, while the lower ends of the latter are coupled to.

said drain pipe through the long nipples n. The several coils are formed with large U- shaped front bends b at points between the pipes 2, 2', the rear portions of the coils being formed with the small bends b. The

upper ends of the coils are coupled to the.

header 2 through nipples n, n, a coil which terminates at the bottom in a short nipple n, being coupled to a long nipple n at the top, and vice versa. In the same .manner the header 3 and its drain pipe 3 are connected by two sets of coils 5, 5", corresponding parts being identified by the same reference numerals and letters. As in my patent aforesaid, so in the present structure the coils of one header and its corresponding drain pipe intersect the coils of the adjacent header and its corresponding drain pipe, the several coils being disposed in vertical planes and intersecting at angles corresponding substantially to the angle betweentwo contignous vertical walls of the casing 1. The

several coils are properlysupported by bars 6 as shown, or otherwise. The fan F is located below the drain pipes 2, 3', the same as in the patented. structure aforesaid.

In the present embodiment of my invention the outlet terminals of the drain pipes 2', 3, (their opposite ends as well as the closed ends of the headers 2, 3, being closed by cap pieces h) are connected by an elbow fitting 8 and a T 9 to a' vertical water collecting tube or pipe 10 into whose lower terminal is inserted a hollow nipple '11 serving as a seat for the lift valve 12,- said valve being suspended from the lower end of a rod or link 13 depending from the outer end of the long arm of a bell-crank 14 mounted in the lower drain pipe 2', the short arm ofthe bell crank being coupled by a short link 15 to the inner closed terminal of a tubular expansion member or rod 16, whose outer open end is coupled to a screw-cap 17 closing the drain pipe at that end. The thermostatic member 16 being hollow and open at its outer end permits the outside air to enter the bore of the member and assist in keeping the same cooled to the point where, when the condensation waters accumulated in the drain pipe (2') have reached a sufiiciently low temperature-will cause the necessary contraction in the member to draw on the link 15 and oscillate the bell crank 14 in proper direction to pull on the link 13 and unseat the valve 12, and allow the water to escape through the tube 10 into any suitabe waste pipe 18. In

the present case the nipple 11 is coupled to the pipe 18 by a union m which allows suflicient play between the members to permit the member 11 to be properly adjusted to the throw of the valve 12. I do not of. course wish to be limited to the thermostatically operated discharge valve here shown, any other equivalent construction mounted in connection with the bottom drain pipe 2 falling within the spirit of my invention.

The operation is obvious from the forego ing but briefly put may be stated as follows; The live steam enters the headers 2, 3. through the fitting 4, or its equivalent, and circulates through the coils connecting the headers with their respective drain pipes 2 and 3. The water of condensation inthe upper drain pipe 3 flows into the tube 10 through the fitting. 8 and T 9, the water in the bottom drain pipe 2 draining into the tube 10 through the T 9, the valve 12 unseating and allowing the accumulated water to escape when the water in the pipe 2 and the air in the bore of the thermostatic member 16 are sufliciently low in temperature to cause the necessary contraction in the member 16 to lift the valve.

By staggering the pipes 5, 5', vertically as shown, that is to say, by disposing the pipes 5 in a horizontal plane above the plane of disposition of the pipes 5, we can introduce into a casing of a given cubic volume extra lengths of pipe without in any wise affecting the free air space bet een contiguous pipes 5, 5, which the rising air currents must traverseas they circulate between the coils on their Way to the outlet opening 0 of the casing. This is apparent from the arrows in Fig. 4, in which the arrows are seen freely rising between two contiguous pipes 5 without obstruction on the part of the pipe 5, the latter pipe beingraised sufficiently to prevent interference vrith said free flow. The circulating air is thus free to absorb the heat units from an increased heating surface, thereby increasing the efficiency of the heater without interfering with the desired circulation of the air currents. Again, without regard to the question of increase of pipe length, by staggering the circulating pipes vertically as shown, so that the pipes of one set of coils are higher than the correspondingpipes of the sets on either side thereof we increase the free air space between the pipes of each set, thereby deriving an advantage which is impossible where all the pipes are disposed in the same horizontal plane. The staggering of the nipples n, n, horizontally permits the installation of the coils 5' without the necessity of unduly increasing the. horizontal spacing between the.

nipples n, said nipples and the nipples n being each disposed in separate rows along the pipe.

Having described my invention what I claim is:

1,.In an air heating apparatus, a suitable casing, steam pipes disposed along the inner surfaces of two contiguous vertical walls thereof, drain pipes. located below the steam pipes and disposed along the corres onding walls with the'steam pipes, indepen ent sets of coils leading from each steam pipe to its corresponding drain pipe or that disposed along the same wall, the sets between the one steam pipe and its corresponding drain pipe intersecting the sets of coils of the other steam pipe and its. drain pipe at substantially the angle which the contiguous walls of the casing make with each other, the individual pipes of the coils of the respective sets being disposed in distinct substantially horizontal planes and out of vertical alinement with one another.

2. In an air heating apparatus, a suitable casing, steam pipes disposed along the inner surfaces of two contiguous vertical walls thereof, drain pipes located below the steam pipes and disposed along the corresponding walls with the steam pipes, independent sets of coils having terminal bends of unequal size leading from each steam pipe to its corresponding drain pipe, the sets between the one steam pipe and its corres onding drain pipe intersecting the sets 0 coils of the o er steam and drain pipes at substantially 3. In an air heating apparatus; a suitable casing, steam pipes disposed along the inner surfaces of two contiguous vertical walls thereof, drain pipes located below the steam pipes and disposed along thecorresponding .walls of the casing, a plurality of sets of coils leading from each steam pipe to its corresponding drain pipe or that disposed along the same wall of the casing, the sets" of coils between oneof the steam pipes and its corresponding drain pipe intersecting the sets between the other steam pipe and its corresponding drain pipe, the ipes of one set of coils being'in staggered re ation to the pipes of an adjacent set.

r 4. In an air heatin apparatus, a suitable casing, a pair of hea ers disposed in superposed planes along the inner surfaces of two contiguous vertical walls of the casin ,drain pipes located below the headers and disposed in superposed planes along the corresponding walls with the headers, one of the head- 'ers and its corresponding drain pi e being exterior to the contiguous header an its corresponding drain pipe, two setsof coils disposed in vertical planes across the casing and spaced apart, extending from each header to its corresponding drain pipe, the pipes ofthe coils of the respective sets being disposed in different horizontal planes, the terminals of the successive pipes respectively connected to the headers and drain pipes be-' ing disposed in staggered relation,-the sets of coils of the respective headers andtheir drain pipes intersecting one another, a fitting connecting the dischar e'ends of the drain pipes to a common out? and a valve for controlling the drain waters through said outlet. Y

5. In an air heating apparatus, a suitable casing, a pair of headers disposed in superposed planes along the inner surfaces of two contiguous walls of thecasing, drain pipes located below the vheaders and disposed in superposed planes along the corresponding walls with the headers, one of the headers and its corresponding drain pipe being exterior to the contiguous header and its corresponding drain pi two sets of coils disposed in'vertical p anes the casing and ed apart, extending from each header to its corresponding dram the p1 es of one set of coils being di a. in d1 arent h orizogiftall.1e lanes from he cogn mgpipes t oon' ous set,t e coils of the respective hai i their drain pipes intersecting one another at an angle conforming substantially to the angle between contiguous walls of the casing, and means for discharging the drain waters from the drain pipes.

6. In an air heatin apparatus, a suitable casing, a pair of bee ers disposed in superposed planes alon the inner surfaces of two contiguous w ls of the casing, drain pipes located below the headers and disposed in superposed planes along the corresponding walls with the headers, one of the headers and its corresponding drain pipe being exterior to the contiguous header and its corresponding drain pipe, a plurality of sets of coils disposed in vertical planes -acro$ the casing and spaced apart, extending from each header to its corresponding drain pipe, the pipes of one set of coils being-disposed in dilferent horizontal planes from the correspondin pipes of a contiguand their drain pipes intersecting one another at an angle conforming substantially to the angle betweencontiguous walls of the casing, and means for efiecting periodic dis charges of the water of condensation fro relatively to one another, the opposite ends of successive coils being alternately coupled to long and short nipples and short and long nipples leading from the headers and drain pipes which said coils connect, and means for discharging the waters of condensation from the drain pipes.

8. In an air heating apparatus of the character described aheader-and a drain pipe therefor, eashheader being provided with horizontally staggered long and short nipples, circulating steam coils each conous set, the coils of t e respective headers necting a long nipple on the header with a 7 short nipple on the drain pipe, and vice versa,

the pipes comprising successive coils being dis osed in di erent horizontal planes.

n testimony whereof I afiix my signature in presence "'of'two witnesses. mNRY BAETZ.

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EMILISTAREK, c Ema M. Simon. 

